Wippa's fashion advice for Karl comes during the Fitzy & Wippa show's weekly 'rap-up' segment during which celebrity guests, in this case Karl and Lisa, are invited into the studio to wax lyrical in a battle of the versus.

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Despite their best attempts to channel their inner rap stars, the Channel Nine presenters became the first ever guests to lose the competition.

Earlier in the segment, Wippa, 37, deserved a slam-dunk remark when he compared the Today pair to their Channel Seven rivals over at Sunrise.

'Stock wearing Birkenstocks!' The Nova host poked fun at Karl's dad style, which he often proudly shows off

'I love you guys; you're classy and posh; you're almost as good as the great David Koch,' the comedian rapped, referencing Sunrise's male host.

When it came to Karl and Lisa's turn to offer their rebuttal, it appears the pair's talents came up short.

Karl was seen gesticulating enthusiastically while delivering his lyrics, adopting a quasi-American accent for the rap.

The weekly rap-up: The comments came during the Fitzy & Wippa show's segment during which the hosts rival celebrity guests, in this week's case Karl and Lisa Wilkinson, in rap

Burn! Earlier in the segment, Wippa also called out Karl and Lisa's breakfast TV rivals Sunrise, rapping: 'You're classy and posh; you're almost as good as the great David Koch'

Lisa raised the fact that the pair were missing from the Logie Awards action earlier this month while taking a swipe at Wippa's weight, rapping: 'And no Logies invite for you two clowns; just as well Wip, you know the camera adds some pounds.'

Despite raising their hands and bouncing to the beat with gusto following the rap, the TV stars were shocked when producer and judge Sarah awarded the win to Fitzy and Wippa, making it the first time a celebrity guest has ever lost.

Meanwhile, Wippa isn't the first to raise concern about Karl's daggy fashion transformation since his split from wife Cassandra Thorburn.

Rap stars: Despite their enthusiasm, Karl and Lisa's rap failed to impress and led to Fitzy and Wippa being crowned the winners

Fancy footwear: This wasn't the first time Karl has been blasted for his choice of footwear, with radio host Kyle Sandilands previously warning the star against sporting the 'ugly sandals'

In February, shock jock Kyle Sandilands told his KIIS FM listeners of how he warned Karl against wearing his favourite sandals.

Claiming to have been texting the father-of-three, Kyle said on-air: 'He begs to hang out with me, it's almost embarrassing,' before detailing his last text to Karl was a mix of fashion advice and getting back in the sack.

'He was wearing those ugly sandals and getting around town in those Birkenstocks,' Kyle explained to his co-host Jackie 'O' Henderson to give context to his message.